In case you hadn’t heard about the cool new kid on the forum block, check out Gamecraft. As founder Levi Kornelsen said:

This is a forum for discussion of tabletop roleplaying games. It is not, by design, a standard forum for general use; for that, visit RPGnet or theRPGsite or ENworld. GameCraft has a mission and a target: To become the best place to refine play from the ground up.

In other words, it’s about making play better, rather than being about game design.